Form grinding apparatus



Now 7, 1939: C;l G FLYGARE 2,179.211

FORM GRINDING APPARATUS Filed Deo. 12, 193s 2 sheets-sheet 2 FII-5E FIE.3

CHRI. GFLYGHRE v 'Patented Novg?, 1939 PATENT OFFICE FORM GRINDING APPARATUS Carl G. Flygare, 'Worcesten Mass., assignor to Norton Company, Worcester, Mass.; a. corporation of Massachusetts Application December 12, 1938, Serial No. 245,203

Claims.

The invention relates to grinding machines, and more particularly to a form grinding attachment therefor.

One object of the invention is to provide a cy- 5 lindrical grinding machine with a form grinding attachment which is simple and thoroughly practical in construction and which is applicable to any of the standard cylindrical grinding machines. Another objectof the invention isl to l0 provide a form grinding attachment for a cylindrical grinding machine whereby a visible indicating device serves to enable the operator to coordinate the manual traverse of the Work table and the manual feeding of the grinding wheel to produce a predetermined form on the work piece. A further object of the invention is to provide a form grinding attachment comprising a forming bar having a pivotally mounted, transversely movable follower which is provided with a pair of dial indicators to facilitate coordinating the manual traverse ofthe work table and the manual feeding of the grinding wheel to reproduce the form or shape on a work piece. Other 0bjects will be in part obvious or in part `pointed out hereinafter. A

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts, as will be exemplified in the structure to be hereinafter described, and

the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, in which is shown one of various possible embodiment of the mechanical features of this invention,

Fig. 1 is a right-hand end elevation of a cylindrical grinding machine embodying the improved form grinding attachment, having partl of the base broken away and part shown in section to more clearly illustrate the machine structure;

Fig. 42 isa fragmentary end elevation, on an .enlarged scale, of the forming device;

Fig. 3 is a fragmentary plan view, on an enlarged scale, of a cylindrical grinding machine embodying the improved forming attachment;

and

Fig. 4 is a fragmentary plan view, on an enlarged scale, of the forming device and footstock.

A cylindricalgrinding machine has been illustrated in the drawings having a base I0 which supports a longitudinallymovable work supporting table Il on the usual V-way I2 and flat way I3 formed on the upper surface of the base Ill. A rotatable grinding Wheel I5 is supported on one end of a Wheel spindle I6 which is rotatably supported in a transversely movable Wheel slide I1. The wheel slide l1 is mounted on suitable ways, such as a flat way and a V-way (not shown) formed on the upper surface of the base IU. The grinding wheel I5 and the wheel spindle 5 I6 may be rotated by any suitable driving mechanism, such as a pulley I3 mounted on the end of the spindle I6 which is connectedv by means of a multiple V-belt `I9 with a suitable source of power (not shown). 10

The grinding wheel slide I1 is arranged tol be moved transversely by means of a wheel feeding mechanism comprising a rotatable feed screw 2D rotatably supported in bearings within the base of the machine. A half nut 2| is xedly 15 mounted to the under surface of the wheel slide I1 and'meshes with the feed screw 20. The forward reduced end portion 22 of the feed screw 2U is slidably keyed within a hollow sleeve 23 which is rotatably journalled in a bearing 24 in 20 the base of the machine. A cylindrical shaft 25 is formed integral with the sleeve. 23 and has a bearing 2E in the base of the machine; A gear 21 is mounted on the outer end of the shaft 25.

The ge'ar 21 meshes with a gear 28 which is 25 nformed integral with a sleeve 29 which supports a manually operable feed wheel 3|). The feed wheel 30 and its associated parts above described are substantially identical with the wheel feeding mechanism shown in the expired patent to 30 Norton No. 762,838 dated June I4, 1904, to which reference may be had for details of disclosure not contained herein.

A traversing mechanism is provided for traversing the work supporting table Il longitudi-f` 35 nally relative to the base I0. This mechanism may comprise a rack bar 35 depending from the under side of the' table Il which meshes with a gear 36 mounted on the inner end of a shaft 31 rotatably supported in a bearing 38 in the base 40 I0 of the machine. A manually operable hand wheel 3 9 is mounted on the outer endof the" shaft 31 by means of which the gear 36 may be rotated and the table I I traversed longitudinally.

A work piece 45 to be ground is supported by a 45 headstock center 46 and a footstock center 41. The headstock center 46 is carried by a headstock 48 (Figi. 3) which is adjustably supported on the table II in the usual manner. The footstock center 41 is supported by a footstock 49 50 which is adjustably mounted on the table II. A manually operable adjusting wheel 50 is provided longitudinally to adjust the position of the footstock center 41 so as to withdraw the same to remove a finish ground work piece and to move it 55 into operative engagement with a new work piece after it has been inserted within the machine.

, A forming bar or template 52 is supported by a, bracket 53 which is supported on the upper surface of the footstock 49. The forming bar or template 52 is provided with an irregularly shaped surface 54 which corresponds with the shape which it is desired to produce on the periphery of the rotatable work piece 45.

A pivotally mounted transversely movable follower 60 is provided which engages the surface 54 of the template 52. The periphery of the grinding wheel I5 is preferably shaped to correspond with the shape of .the follower 60. The follower 60 is pivotally supported by means of a stud 6| which is carried by member 62. The

member 62 is slidably supported within a bracket 63 which is adjustably fastened onto the upper surface of the wheel slide |1. The member 63 is` provided with an elongated slot 64 through which pass avpair of adjusting screws 65 and.

'within an elongated arcuate slot 69 formed in the transversely movable slide member 62. The elongated slot 69 together with theguide stud 68 serves to limit the swinging movement of the follower member 60. The follower member 6D together with its enlarged supporting member 61 is preferably held in a central position by means of a spring actuated mechanism. The enlarged portion 61 of the follower member 60 is provided with a pair of spaced pins 12. The transversely movable slide member 62 is also provided with a pair of spaced pins which are spaced equi-distant to the spacing of the pins 12. A compression spring 14 is contained within the telescopic tubular members 15 and 16. The outer end of the tubular member 15 is provided with a V-shaped end 11 which engages the pins 13 and 12. 'I'he tubular member 16 is similarly provided with a V-shaped end surface 18 which is arranged to engage the pins 13 and 12, respectively, on the opspring 14. The spring 14, however, serves normally to exert a pressure tending to return the follower 60 to a normal or central operating position. A dial indicator 80 is mounted on the transversely movable slide member 62. The dial indicator is provided with an actuating plunger 8| which is arranged in the path of an adjusting screw 82 which is in turn screw threaded in a bracket 83. The bracket 83 is xedly bolted to the enlarged portion 61 of the follower member 60. When the follower 60 is in a balanced or central position, that is, out of engagement with the template 52, the adjusting screw 82 is turned to set the dial indicator so that the needle reads zero. After this setting of the dial indicator. any deflection of the follower 60 will produce a rocking movement of the enlarged head portion 61 which will transmit this motion through the adjusting screw 82 to cause a movement of the dial indicator plunger 8| so that the dial indicator will read either in ten thousandths of an inch or otherwise depending onthe nature of the dial gauge. The extent of deflection of the follower 68 is visibly indicated on the dial gauge 88. y

The transversely movable slide member 62 has a rearwardly extending portion which is substantially rectangular in cross sectional area and which slides within an aperture 85 (Fig. 2) within the enlarged end portion 86 of the transversely arranged supporting member 63. A compression spring 81 contained within the aperture 85 serves normally to exert a pressure toward the left (Fig.

, 2) to urge the slide 62 toward the 4left so as to maintain the follower 60 in operative engagement with the template 52 during the longitudinal movement thereof. A dial indicator 88 is supported by the transversely movable slide 62 and is provided with an actuating plunger 89. The transversely adjustable supporting member 63 is provided with a bracket 90 which supports an adjusting screw 9| which is arranged in alignment with the plunger 89 of the dial indicator 80. The adjusting screw 9| serves to facilitate adjustment of the dial indicator 88 so that a zero reading may be readily obtained in setting up the forming apparatus. l

In the operation of this improved form grinding apparatus, the transverse slide 63 is adjusted transversely so that the follower 60 is in engagement with the operative face of the forming bar when the follower 60 is at a most forward position/ in its path of movement. The transverse adjustment of the slide 63 is sufficient to compress the spring 81 to maintain the follower 60 in operative engagement with the operative surface 54 of the template 52. 'I'he adjusting screws 82 and 9| are then adjusted so that the dial indicator needles of the dial indicators 88 and 88 respectively read zero. The machine is then in adjusted position for a grinding operation. A work piece is placed on centers 46 and 41 and a suitable driving dog is provided so that the rotary movement of the headstock is transmitted to rotate the work piece 45 for a grinding operation. The hand feed wheel 36 is then rotated to move the grinding wheel l5 and its supporting slide |1 transversely into operative engagement with the work piece 45, at which time the hand traverse wheel 39 is rotated to start a longitudinal traversing movement of the Work piece relative to the grinding wheel.

By controlling the longitudinal movement of the table and the transverse movement of the wheel slide I1 by means of the hand wheels 30 and 30, respectively, so that the dial indicators 88 and 88 respectively read zero during the entire pass of the work piece across the face of the wheel, an exact duplication of the shape o'f the surface 54 of the template 52 will beobtained. During the longitudinal movement ofthe work table Il, which in turn carries the template 52 therewith, excess longitudinal movement of the table will cause a pivotal deflection of the follower 60 which will be readily visible on the dial indicator 89. Similarly, an excess movement of the transverse movement of the wheel will be indicated on the dial indicator 88. By manually coordinating the manual rotation of the hand wheels 30 ,and

3,9, the table and wheel will be moved longitudinally and transversely respectively .to reproduce a shape of the desired and predetermined extent.

By changing the shape of the bar or template .52, any desired shape on the work piece may be produced. The template 'B2 is preferably atljustably mounted (Fig. 3) and is locatedin a deiin'ite position relative to the work piece l5 so that the relation between the follower 60 and the template surface 54 corresponds with the shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting: sense. v

I claim:

l. Ina grinding machine having a rotatable grinding wheel and a rotatable work support which are movable longitudinally and transversely relative to each other, a visible indicat` ing form grinding attachment including a template and a pivotally'mounted transversely movable follower one of which is mounted to move with the grinding wheel and the other to move with the work support, and means including a dial indicator which is actuated by said follower to register relative pivotal and transverse movements of said follower during the relative longitudinal and transverse movements of the-grinding wheel and work support to facilitate grinding a predetermined form on the work piece.

2. In a grinding machine having a-base, a rotatable grinding wheel, a transversely movable slide therefor, a feeding mechanism including a manually operable feed wheel to move said slide and wheel transversely in either direction, 'a loning bar,- a transversely 4movable pivotally mounted l follower and an indicator associated therewith' which rserve to register movements of said follower during the relative longitudinal and' transverse movements between the grinding wheel and work support'whereby coordinated actuation of the traverse and feeding mechanisms serves'to grind a predetermined form on said workpiece.

3. In a grinding machine having a rotatable grinding wheel and a rotatable work support which aremovable longitudinally and transversely relative to each other, a visible indicating form grinding attachment including-a forming bar and a pivotally mounted transversely movable follower one of which Iis movable with the grinding wheel and theY other movable with the work support, a dial indicator which serves to register relative pivotal movement of said follower. and a second dial indicator which serves to register transverse movement of said follower during the relative longitudinal and transverse movements of the grinding wheel and work support to facilitate grinding a predetermined `form on the work piece.

4. In a grinding machine having a base, a rotatable grinding wheel, a'transversely movable slide therefor, a manually operable feeding mech; anism for the wheel and slide, a `longitudinally movable table, a manually operable traverse mechanism tol traverse said table longitudinally in either direction, a rotatable work support on said table, and a visible indicating form grinding attachment therefor including a forming bar supported by said table, a transversely movable.

pivotaliy mounted follower adjustably supported by said wheel slide, and an indicator associated with said follower which serves visibly toreglster relative pivotal and transverse movements of said follower during relative vlongitudinal and transverse movements of the grinding wheel and work support to facilitate grinding a predetermined shape on the work piece.

5. Ina grinding machine" having a basea rotatable grinding wheel, a transversely movable slide therefor, a feeding mechanism including `a manually operable feed wheel to move said slide l and wheel transversely in either direction, a longitudinally movable table, a manually operable traverse mechanism therefor to traverse the table longitudinally in either direction, a vrotatable work support on said table, and a visible indicating form grinding attachment including a vtemplate supported by said table and a pivotally mounted transversely movable follower adjustably supported by said wheel slide, a dial indicator which serves to register relative pivotal movement of said follower, anda second dial indicator which serves visibly to register relative transverse movements of said follower during coordinated relative longitudinal and transverse movements between the grinding wheel and work 56 support. to facilitate grinding a predetermined 

